feat(ICollection/Layer): Group Rewrite

build.js

@@ -195,6 +195,8 @@ var filesToInclude = [
   'src/shapes/polygon.class.js',
   'src/shapes/path.class.js',
   'src/shapes/group.class.js',
+  'src/shapes/icollection.class.js',
+  'src/shapes/layer.class.js',
   ifSpecifiedInclude('interaction', 'src/shapes/active_selection.class.js'),
   'src/shapes/image.class.js',